(CNN) - Ferguson, Missouri, police Officer Darren Wilson, in his first interview since he fatally shot unarmed teenager Michael Brown, said he's not tormented by that fateful encounter on a street in suburban St. Louis last summer.

"I don't think it's haunting," Wilson told ABC News on Tuesday. "It's always going to be something that happened. The reason I have a clean conscience is that I know I did my job right."

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